Means for controlling vibratory screens



Sept. 19, 1944. J. H. 'v. FINNEY ETAL MEANS FOR CONTROLLING VIBRATORY SCREENS 2 Sheets-Sheet 1 Filed 001;. 7, 1941 Sept. 19, 1944. J. H. v. FINNEY EAL MEANS FOR CONTROLLING VIBRATORY SCREENS Filed Oct '7, 1941 2 Sheets-Sheet 2 INVENTORS.

N w Ma y W w M W J Patented Sept. 19, 1944 UNITED STATE-Sf; PATENT OFFICE a 2,358,449 I a CONTROLLING VIBRATORY I r J 01in H. VLFiimeyahd Grant Ellen, Denver, (3010., assignors toMifiing-TProces's'fand'Patent oompan'y, Denverifcol'm a corporation ofDelaware Application'octob'er 7, 1941, Serial No. 413,938

IS'CLaims. (01. 2 95413) This invention relates to an improved means for controlling the operation of vibrating screens and the like. Q

Vibrating screens are ordinarily mountedat an angle which is inclined from horizontal, the

slope of the screen depending upon l'ocal 'condi'-' tions such as the nature of the materialbeing' screen, the fineness of such material, the results time to time thus requiring additional changes.

in the angle of inclination; V V

1 Heretofore, a change in the angle of incl-ination of a vibrating screen has been a rather diff, ficult and laborious job because associated supporting and operating mechanism had to under-- go a major alteration. A furtherand particular objection to such changes after a screen hasbeen installed is that the point of feed of material to' the screen has hadto be raised or lowered.

; Therefore, it is a general object of the present 3 screening apparatus that is well suitedto perform the present method;

Fig. 2 is'a sectional View as approximately in dicated by the line 2'2 ofthe Fig. 1; f

\ Fig." 3 is a fragmentary sectional view taken 1 approximately along the line 33 of Fig. 1 and prior patent'does not teach the present improved method so that even though the present apparatus is an improvement over said; Dillon screen, nevertheless the. present method is an entirely new concept. The present improved method is invention to provide a method of controlling the,

operation of such vibratingscreens whereby-cant Another object is to provide such; a method-f of screen control wherebythe angle of inclination of a vibrating screen may be changed while maintaining the actual operation or the screen which has the improved advantages ofeliminating lost time and enabling'auser to obser'veand compare variations in operating results so that optimum conditions may be obtained. w L In order to disclose typical mechanism that is well adapted to perform the present method, the I accompanying drawings, in which likeparts have been similarly designated, will be described in some particularity; Inthe drawings:

'Fig;,1 isa side elevationjpartially in section of} I ably th'e low'er end' be'am element] support l8v I 9+2 o,- ;2 I wom be "duplicated at both sides 7 not limited to the specific apparatus herein set forth.

Inorder to overcome the difficulties'and' accompnsn the objectives hereinbeforejreferred to, a

supporting superstructure l5,'Figs'.1 /and 2, is-

provided. structure" may be) made of tim-' bers as illustrated or it may be constructed of steel or any other suitable'materiaLor it may even be a portionof the buildingv in which the screen is installed. j a

beam element I6 is securelyfpivoted atonefoi its ends, to the superstructure-l 5* as indicated'at H. The other orlowerend ofthe beam'elem'ent ISiis also supported fromthe superstructure I'5 by means of a wire ropeforvca'ble l8 that is held inan eyebolt 19 which depends from said superstructurerj Thefjwire rope or able I3 is 'also'conriected' witlia turnbucklefllwhich is.-@ttached t0 the beam structure l6" asishownfat'fl. Prefer 'of' the" beam element" [6; Under some circumstances the screen may beop'erated,substantially Ievel'orthedischarge 'ii'd mayb'e'sofnewhat higher than the feed .end'but usually. it is v.lo'vvefas illustrated. j 1 'Asfc'reen element indicated as awholeby referenee character"zzis'suspendearrdm the beam 7 element l6 by means of rods" 23 th' lo'wer ends oiwhic'h are carried in a 'i'glefbracket's' 24 which inturn are pivoted as at'fZ B' tolthesi'dslof'the. 1

screen element 22'. Theupperehdsof-the rods 23 are carried in compression .springiiiiv which in 'turn' are seated in angle brackets zillthatlare herein ill ustra'ted element l6.

pivotally mounted on the sides of the beam element [6. The details of the rods 23 and their mountings and connections are well illustrated in Fig. 3.

Carried in the screen element 22 are a plurality of screens 28 and 29 and a feed chute for the screen element is indicated at 30 having. a point of discharge closely associated with the upper screen 28 as shown at 3|.

Adjacent the end of the screen element 22 that is opposite from the feed chute 30 are discooperate respectively with the'screens 28 and 29.

It will be understood that any; number of screens j in turn is bushed by a sleeve 4! to relieve the bolt from shearing stresses that otherwise would be exerted thereagainst.

It will be seen that the compression spring 26 is supported on a rubber cushion 42 carried in the bracket 21, and immediately below said bracket is a bumper element 43 on the rod 23, that is provided with a rubber bumper or cushion 44.

The lower end of the rod 23 is carried in the bracket 24 ;which is pivoted at 25 to the screen charge chutes 32 and 33 that are positioned to.

which is carried upon the beam element. I 6. .Said 5 motor base 35 is urged upwardly by means of compression spring '36 to maintain suitable"ten-' sion in a y -belt 31 that transmits power from the 'ter line passing through the axis of pivotal connection of the rods 23 with the beam element 16.

Dimension B is the distance between a center line passing through the point of feed 3i and another center line passing through the axis or pivotal connection 25 of the lower ends of rods 23 to the screen element 22. Furthermore, the distances between the pivotal connection of the upper rod 23 to the beam element l6, and the pivotal con:- nection' I! is substantially equalto the distance between the pivotalconnection'25 of the upper rod 23 with the screen element 22, and the point offeed3l. b

Thus it will beseen that during angular movement of the beam element l6 'as efiected by o'pere ation of .the turnbuckle and in any angular position in which said beam element I6 may be placed, the entire assembly, I622---23. operates and exists as aparana gra so thatthe relationship or the upper end of. the screen ele-, ment 22 does not change to anyappreciable extent with reference toth point of'feed 3|. Fur

v thermor'e, during-such angular'movement of the beamelement l6 and'the screen element' 22, the compression spring 36 operates to maintain suit-. able'tensioninthedriye belt 31. ff 7 j It is manifest'thalt if a greater jchang'e in'the angle of the beam element l6 thancan be effected by the turnbuck1ei20, desired,.then the cable l8 canbe taken up or let'out 'through'the eye bolt IS as desired; Furthermore, the supporting cable I 8 and its associated componentsare merely typical and other "mechanical means'may be pro-' vided for supporting the 'end'of the beam element 16 that is opposite its pivotal connection jl'l."

Next referringto Fig; 3, itwill be understood that ordinarily two connecting-rods 23 will be used on each side of thebeam element l 5 and the screen element 22. Fig.3 illustrates atypical connecting rod 23 suspended in the "compression spring 26 which in turnis seated in the bracket 21 which is pivotally attached atf40 to the beam This pivotal attachment'readilyfmay be effected by'means of a machine bolt as illustrated, which element 22 by means of a machine bolt as illustrated. This bolt isalso bushed by a sleeve 4| gfifor-the"purposes hereinbefore described. Where the lower end of rod 23 passes through the bracket 24 it is cushioned in rubber as illustrated ,at 45. The, purpose of the rubber mountings 42 shock particularly when the screen is first set into vibratory movements and before it has acquired its full harmonic frequency.

with the beam element l6 and with the screen element22 thus providing the movable parallelogra'm action herein defined. This parallelogram. actionis well illustrated in. Fig. 4 wherein the solid lines illustrate a position of the parallelo- L gramcorrespondingto that illustrated in Fig. 1. andthe broken lines indicate another typicalp'osition to which the parallelogram may be moved while'maintaining the important parallel relationship of the components and particularly while maintaining the original-relationship between the feed end of the screen element and the feed! upon said bracket may'be se'cuIeIy bolted to the beam element; .ZLikewise; holes may be drilled in the'scr'een'element22 corresponding to the aperture 41 in each bracket 24 whereby said' brackets may be securely bolted in fixed position I with reference to the screen element. s Fig.5 illustrates diagrammatically another embodiment of the same operating principle whereashereinbefor defined.

in a beam element l6a issupported on standards 48and 49.: The beam element [6a is pivoted at l'la to the fixed standard 48 and'the screen element '22 which is supported on rods 23 above.

tion' of theibeam element I611 may be varied:

about.its pivotal. axis llaand the parallelogram action of theseveralcomponents will be, the same Obviously theibeam element lliofj Figs. 1 and 2 may be supportedjby standards; if -desired, similan toathose suggested in Fig.5; and; the beam element jfia of Fig. 5 can;well be. supportedby superstructure similargto. that suggested in Fig. 1. Themechanical means for supporting the beam element; 16; or [B issubJ'ectto selective variation according to, installafti n requirements and the.

parallelogram relationship willfbe maintained .1 h ou ou w de se ec q i P g m r prtsenrpl i .1 It is manifest that as a nseduence of the parallelogram arrangement herein disclosed, the

angle ofdnclination or thebearr'relement I6 and the screen element 22;. may be ,Varied without changing the drive belt 31, because the compression spring 36 will maintain a suitable tension in said belt inall normal angular positions of the apparatus. The variations in the distance between the drive pulley of the motor and th driven pulley on the screen element arequit small and readily can be compensated for by the compression spring 36. g

What we claim and desire-to secure by Letters Patent is:

.1. In. screening apparatus, a. rigid supportingmember suspended for movement about a pivotal.

axis at at least one'of its ends, a'screening member, suspension members mounted for pivotal movement on said rigid member. and extending from the rigid member in pivotal connection with the screening member adjacent its ends to permit movement between said members to selective angular positions, said members being constructed and. arranged to form a parallelogram in which angular movement of onejof said members willv produce conjoint changes in the positions of the other of'saidmembers and thereby maintain a parallel relationship between the initially parallel members, and means for holding said angular position of the members constant in each selective position.

2. In screening apparatus, a rigid supporting member suspended for movement about a pivotal axis at at least one of its ends, a screening member, suspension members mounted for pivotal movement on said rigid member and extending from the rigid member in pivotal connection with the screening member'adjaeent its ends to per-- mit movement between said members to selective angular positions, said membersbeing confstructe ed and arranged to form a parallelogram in which angular movement of one of said members will produce complementary changes in the positions of the other of said members and thereby maintain a' parallel relationship between the initially parallel; members, and means for holding said angular: position of the members constant in each selective position.

3. In screening apparatus, a rigid-supporting. member suspended for movement about a pivotal axis at at least one of. its ends, a screening member, suspension members mounted for pivotal I movement on said rigid member and extending from the rigid member. in pivotal connection with,

the screening member adjacent its ends to permit movement between said members to selective angular positions-said members being, constructed and arranged to fornra parallelogram in which and. meansfor holding said angular position of the members constant ineach selective position. 5. Apparatus forscreening loose material, com-. prising a beam .member, a screening member, connecting members pivoted on the beam member and on the screening member and disposed in parallel relationv for suspending the screening member from the beam member, means positioned to act on said members for imparting vibratory movement thereto, a fixed support, a pivotal connection holding one end of said beam member on the support, a flexible-connection holding theother end of'said beam member on said support and being of .sufiicient length to incline .thescreen member at difierent angular. positions from the support, and a material feeding device disposed in uniform proximity to the upper endof the screening member in, the variousinclined positions of said screen member.

6. Apparatus for screening loose material, comprising a beam member, a screening member,-: connecting members pivoted on the beam member and on the screening member and disposed.

in parallel relation for suspending the screening member from the beam member, means, posi-' tioned to act onsaid members for imparting vibratory movement thereto, a fixed support, a pivotal connection holding one end ofsaid beam member on the support, a flexible connection holding the other end of said beam member on said support and being of sufficient length to incline the screen member at different angular positionsfrom the support, adjustable means for varying thelength of said flexible connection to thereby'change the inclination of the; screening 7. Apparatus for screening loose materials, com

prisinga beam member, a screening member, connectingmembers pivoted on the beam member and on the screening member and disposed.

in parallel relation for suspending the screening member fromfthe beam member, means DOSie tioned to act on said members' for imparting vibratory'movement thereto, a fixed support, a

pivotal connection holding one end of saidbeam member on the support, 'anextensible connecting member holding'th'e other endof said beam mom'- beron said support ina position to incline thea for rotating the'scr'eening member abouta fixed suspension members mounted for pivotal movemember to selective angular positions'said members being constructed and arranged to-form a parallelogram in which angular movement of one of the members will .produce complementary changes in the positions of the other of said members and thereby maintain a parallel rela- I tionship between the'initially parallel members,

.the extensible member;

8. In the art of screening loose materials, in which vibratory screening apparatus, consisting axis'adjacent said feeding device by extension" of of a rigid member, a relatively movable screening member having each of its ends pivotally suspended from the rigid member and pulsating means arranged to eiTect said relative movement and thereby vibrate the apparatus, is disposed at an inclination in material-receiving relation to a fixed feeding device, the improvement which comprises suspending said apparatus for variation ofthe inclination of its screening member by movementof same aboutfa fixed axis of rota- 1 movement about a pivotal axis at at least one of its ends, a screening member, connecting rods pivoted on the beam member and on the screening member. and disposed in parallel relation for suspending the screening member from the beam member in parallel relation thereto in various angular positions, an eccentric acting on one of said members, a prime, mover onlthe other.

of said members, power transmission meansextending between the prime mover and the reccentric, and means for maintaining uniform spacing between .the prime mover and eccentric in the different angular positions of said members. 10. Screening apparatus comprising a rigid supporting member adjustably suspended for movement about a pivotal axis at at least one of its ends, a screening member, connecting rods pivoted on the beam member and on the screening member and disposed in parallel relation for suspending the screening member from the beam member ingparallel relation theretolin various angular positions, an eccentric'acting on one of said members, a prime mover on the other of said members, power transmission means extending between the prime mover and the eccentrio, and flexible means for maintaining uniform spacing between the prime mover and eccentric in the different angular positions of said members.

11. Screening apparatus comprising a rigid supporting 'member adjustably suspended for movement about a pivotalaxis at at least one of its ends, a screening member, connecting rods pivoted on the beam member and on the screening member and disposed in parallel relation for suspendingthe screening member from the beamv member'in parallel relation thereto'in various angular positions, an eccentric acting on one of said members, a prime mover on the other of said members, power transmission means extending between the prime mover and the eccentric, and spring-actuated means for maintaining uniform spacing between. the prime mover and eccentric in the difierent angular positions of saidm'eim bers.

13. In' apparatus of .the character described, a beam element pivoted at on end to a stationary support and having its opposite end adjustablysupported to position the beam element in 1 different angular positions, screening means in' spaced parallel relation to said beam element, a feeding device in proximity to said pivotal supportof the beam element for delivering material to be treated to the screening means, and a plurality'of parallel connecting members pivoted to said beam element and pivoted to said screening means for maintaining the parallel relationship between said members constant throughout the range of angular movement of the beam element and maintaining a uniform relationship between the feeding device and said screening means in the various angular positions of the beam element. 14; In apparatus of the character described,

a beam element pivoted at on end to a stationrelationship between the feeding device and said screening means in the various angular positions of the beam element. I l

'15. In apparatus of the character described, a beam element'pivoted at on end to a stationary support and having its opposite end adjustably supported to positionthe beam element in different angular positions, means for varying the elevation'ofthe adjustable support to thereby .12. Screening apparatus comprising a' rigid V supporting member; adjustably suspended for movement about a pivotal axis at atleast one of itsends, a screening member, connecting rods pivotedon the beam member and on the screening member-and disposed in parallel relation for suspending the screening member from the beam member, in parallel relation thereto in various angular positions, an eccentric acting on the screening member, a prime mover on the supporting member, ;p0wer transmission means extending between the prim mover and the eccentric, and a flexible mounting for the prime mover to maintain uniform spacing between said prime mover'an'd the eccentric in the different angular positions of said members.

change the angular position of said beam ele- V ment, screening means in-spacedparallel relation to said beam element; a feeding device in proximity to said pivotal support of the beam element for delivering material to be treated to the screening meansQand' a plurality of parallel connecting members pivotedto said beam element and pivoted to said screening means for maintaining the 'parallel relationship between said members constant throughout the range of angular movement of the beam element and maintaining "a uniform relationship between the feeding' device and said screening means in the various angular positions of the beam element.

'JOHN H. V. FINNEY. GRANT ELLEN, 

